I find a workaround for this bug.

In my case the PlotView is used in a DataTemplate (In a Windows Style Metro App)

<HubSection Header="Graphic" HorizontalAlignment="Stretch" >
   <DataTemplate>
      <metro:PlotView Model="{Binding CurrentPlotModel}" MinWidth="1024" MinHeight="500" />
   </DataTemplate>
                </HubSection>

When my page is displayed the first time it works.
For the second display, in my viewmodel, I've updated the CurrentPlotModel , and  I have the bug.

CurrentPlotModel = new PlotModel {....}

The solution:

Before updating the CurrentPlotModel with the new value, I set it to null AND I call the garbage collector to clear correctly the plotview association.

CurrentPlotModel = null;<br>                    GC.Collect();<br>CurrentPlotModel = new PlotModel {....}

This is my only workaround. I've tested many many other cases, with no success.